Even though I completely agree that an unplanned pregnancy can have many emotional effects on a man, that's all they are - emotional effects. The woman is saddled with those as well as with all of the physical effects including a lot of risks of injury or death. Forcing or coercing someone to go forward with something against their will that could harm or kill them is completely unethical. Because of that, the man really ought to have zero rights until the point when he becomes a father (and not just a sperm donor) because the woman has to assume all the risks.